Data logger



FIG. 1 is a front view of a data logger showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a perspective view 1 thereof; and,

FIG. 8 is a perspective view 2 thereof. 

The ornamental design for a data logger, as shown. 